Title: Long-lived magnetization in an atomic spin chain tuned to a diabolic point Show Chinese title

Title: 原子自旋链在调谐到双极点的长寿命磁化

Abstract: Scaling magnets down to where quantum size effects become prominent triggers quantum tunneling of magnetization (QTM), profoundly influencing magnetization dynamics. Measuring magnetization switching in an Fe atomic chain under a carefully tuned transverse magnetic field, we observe a non-monotonic variation of magnetization lifetimes around a level crossing, known as the diabolic point (DP). Near DPs, local environment effects causing QTM are efficiently suppressed, enhancing lifetimes by three orders of magnitude. Adjusting interatomic interactions further facilitates multiple DPs. Our study provides a deeper understanding of quantum dynamics near DPs and enhances our ability to engineer a quantum magnet. Show Chinese abstract

Abstract: 将磁铁缩小到量子尺寸效应变得显著的程度会引发磁化率的量子隧穿（QTM），深刻影响磁化动力学。 在精心调节的横向磁场下测量铁原子链中的磁化切换，我们观察到在能级交叉附近磁化寿命出现非单调变化，这被称为双极点（DP）。 在DP附近，导致QTM的局部环境效应被有效抑制，使寿命提高了三个数量级。 进一步调整原子间相互作用可以促进多个DP的出现。 我们的研究提供了对DP附近量子动力学的更深入理解，并增强了我们设计量子磁体的能力。